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in Optics by (48.1k points)
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The image obtained with a convex lens is erect and its length is four times the length of the object. If the focal length of the lens is 20 cm, calculate the object and image distances.

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by (48.5k points)
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Best answer

 Heref= 20 cm, m = + 4 for a virtual image. 

To calculate u, we have

m = \(\frac{f}{u + f}\)

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